From: Thierry Reding <treding@nvidia.com>
Date: Thu, 9 Mar 2017 19:04:57 +0000 (+0100)
Subject: gpu: host1x: Fix potential out-of-bounds access
X-Git-Tag: v4.14-rc1~983^2^2~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8cadb01d2c2f520a890d1bc78b45471f21b9b76d;p=platform%2Fkernel%2Flinux-rpi.git

gpu: host1x: Fix potential out-of-bounds access

The check for valid syncpoint IDs is off by one. While at it, rewrite
the check to make it more easily understandable.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
index 25c11a8..0ac026c 100644
--- a/drivers/gpu/host1x/syncpt.c
+++ b/drivers/gpu/host1x/syncpt.c
@@ -484,7 +484,7 @@ unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)
 
 struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, unsigned int id)
 {
-	if (host->info->nb_pts < id)
+	if (id >= host->info->nb_pts)
 		return NULL;
 
 	return host->syncpt + id;